Southwestern Energy Announces Public Offering of Common Stock

Southwestern Energy Company (“Southwestern Energy”) (NYSE: SWN) today announced the commencement of an underwritten public offering of 55,000,000 shares of its common stock (the “offering”), subject to market and other conditions. Southwestern Energy intends to grant the respective underwriters a 30-day option to purchase up to 8,250,000 additional shares of its common stock. Southwestern Energy intends to use the net proceeds from the offering to partially redeem Montage Resource Corporation’s (“Montage”) issued and outstanding senior notes that it will assume upon the closing of its recently announced merger with Montage (the “Merger”). If the Merger is not consummated, Southwestern Energy intends to use the net proceeds from the offering for general corporate purposes, including the repayment of debt. Until Southwestern Energy applies the net proceeds from this offering for the purposes described above, it may invest such proceeds in short-term, liquid investments or to reduce the balance under its credit agreement. The net proceeds from any exercise by the underwriters of their option to purchase additional shares of common stock from us will be used to redeem additional Montage notes after the consummation of the Merger or for general corporate purposes, including the repayment of debt.

Citigroup, Goldman Sachs & Co. LLC and J.P. Morgan are acting as representatives of the underwriters and joint book-running managers for the offering.

The offering is being made under an effective automatic shelf registration statement on Form S-3 (Registration No. 333-238633) filed by Southwestern Energy with the Securities and Exchange Commission (“SEC”) and only by means of a prospectus supplement and accompanying prospectus. A preliminary prospectus supplement has been filed with the SEC to which this communication relates. Prospective investors should read the preliminary prospectus supplement and the accompanying prospectus included in the registration statement and other documents Southwestern Energy has filed with the SEC for more complete information about Southwestern Energy and the offering. These documents are available at no charge by visiting EDGAR on the SEC website at http://www.sec.gov.

Alternatively, a copy of the base prospectus and the preliminary prospectus supplement may be obtained, when available, from:

Citigroup
c/o Broadridge Financial Solutions
1155 Long Island Avenue
Edgewood, NY 11717
Telephone: 800-831-9146

Goldman Sachs & Co. LLC
Attention: Prospectus Department
200 West Street
New York, NY 10282
Telephone: 866-471-2526
Facsimile: 212-902-9316
Email: Prospectus-ny@ny.email.gs.com

J.P. Morgan Securities LLC
c/o Broadridge
Financial Solutions
Attention: Prospectus Department
1155 Long Island Avenue
Edgewood, NY 11717
Telephone: 866-803-9204

This news release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities, in any state or jurisdiction in which such offer, solicitation or sale of these securities would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Southwestern Energy

Southwestern Energy Company is an independent energy company engaged in natural gas, natural gas liquids and oil exploration, development, production and marketing.

Forward Looking Statement

This news release contains forward-looking statements. Forward-looking statements relate to future events, including, but not limited to, anticipated results of operations, business strategies, other aspects of Southwestern Energy’s operations or operating results, the proposed offering, the use of proceeds of the offering and the consummation of the Merger. In many cases you can identify forward-looking statements by terminology such words “believe,” “expect,” “anticipate,” “plan,” “intend,” “foresee,” “predict,” “budget,” “should,” “would,” “could,” “attempt,” “appears,” “forecast,” “outlook,” “estimate,” “continue,” “project,” “projection,” “goal,” “model,” “target,” “potential,” “may,” “will,” “objective,” “guidance,” “outlook,” “effort,” “are likely” and other similar expressions. Where, in any forward-looking statement, the company expresses an expectation or belief as to future results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, there can be no assurance that such expectation or belief will result or be achieved. The actual results of operations can and will be affected by a variety of risks and other matters including, but not limited to, changes in commodity prices; changes in expected levels of natural gas and oil reserves or production; operating hazards, drilling risks, unsuccessful exploratory activities; limited access to capital or significantly higher cost of capital related to illiquidity or uncertainty in the domestic or international financial markets; international monetary conditions; unexpected cost increases; potential liability for remedial actions under existing or future environmental regulations; potential liability resulting from pending or future litigation; and general domestic and international economic and political conditions; as well as changes in tax, environmental and other laws applicable to the company’s business. Other factors that could cause actual results to differ materially from those described in the forward-looking statements include other economic, business, competitive and/or regulatory factors affecting the company’s business generally as set forth in the company’s filings with the SEC. Unless legally required, Southwestern Energy Company undertakes no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.